Concertgoers at this weekend's festival will be able to find their tents at night by using a special app on their smartphones.

Gardai will be tweeting regularly on traffic and safety issues for those amongst the 70,000-plus expected each day.

Tomorrow, a huge logistical operation will begin as campsites open at Punchestown Racecourse.

Beyonce, Coldplay, The Strokes, The Script and Foo Fighters are just some of the big names performing at the three- day event, dubbed yesterday by festival organisers as "the best line-up that Europe has ever seen at one festival".

"It's fantastic we have managed to pull this one together," festival director John Probyn told the Irish Independent.

But with showers expected on Friday before weather gradually improves on Saturday and Sunday, it wasn't long before talk at a press conference with organisers and gardai turned to the dreaded three-letter word revellers fear most: mud.

"We have spent a considerable amount over the last few years putting drainage and infrastructure in place to minimise its effect ," said Mr Probyn.

Gardai have issued travel advice to those attending, asking festivalgoers to use public transport where possible.

Enhanced park-and-ride facilities will be available at a number of locations, with in excess of 7,000 car parking spaces. More traffic information will be provided via Twitter on @gardatraffic.

Concertgoers need not haul trays of beer to the festival either, with new campsite bars selling six cans of beer for €12.

Tickets for Oxegen are still available. Day tickets cost €99.50, while weekend tickets are €224.50.